From owner-svn-src-stable@freebsd.org Thu Oct 13 03:10:05 2016 Return-Path: Delivered-To: svn-src-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 87217C0E586; Thu, 13 Oct 2016 03:10:05 +0000 (UTC) (envelope-from lidl@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 40802189F; Thu, 13 Oct 2016 03:10:05 +0000 (UTC) (envelope-from lidl@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id u9D3A46J016401; Thu, 13 Oct 2016 03:10:04 GMT (envelope-from lidl@FreeBSD.org) Received: (from lidl@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id u9D3A4jd016400; Thu, 13 Oct 2016 03:10:04 GMT (envelope-from lidl@FreeBSD.org) Message-Id: <201610130310.u9D3A4jd016400@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: lidl set sender to lidl@FreeBSD.org using -f From: Kurt Lidl Date: Thu, 13 Oct 2016 03:10:04 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r307173 - stable/11/sys/netinet X-SVN-Group: stable-11 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Oct 2016 03:10:05 -0000 Author: lidl Date: Thu Oct 13 03:10:04 2016 New Revision: 307173 URL: https://svnweb.freebsd.org/changeset/base/307173 Log: MFC r306458: Properly preserve ip_tos bits for IPv4 packets Restructure code slightly to save ip_tos bits earlier. Fix the bug where the ip_tos field is zeroed out before assigning to the iptos variable. Restore the ip_tos and ip_ver fields only if they have been zeroed during the pseudo-header checksum calculation. Modified: stable/11/sys/netinet/tcp_input.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/netinet/tcp_input.c ============================================================================== --- stable/11/sys/netinet/tcp_input.c Thu Oct 13 03:08:32 2016 (r307172) +++ stable/11/sys/netinet/tcp_input.c Thu Oct 13 03:10:04 2016 (r307173) @@ -601,7 +601,7 @@ tcp_input(struct mbuf **mp, int *offp, i #ifdef TCP_SIGNATURE uint8_t sig_checked = 0; #endif - uint8_t iptos = 0; + uint8_t iptos; struct m_tag *fwd_tag = NULL; #ifdef INET6 struct ip6_hdr *ip6 = NULL; @@ -673,6 +673,7 @@ tcp_input(struct mbuf **mp, int *offp, i /* XXX stat */ goto drop; } + iptos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; } #endif #if defined(INET) && defined(INET6) @@ -699,6 +700,7 @@ tcp_input(struct mbuf **mp, int *offp, i th = (struct tcphdr *)((caddr_t)ip + off0); tlen = ntohs(ip->ip_len) - off0; + iptos = ip->ip_tos; if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) th->th_sum = m->m_pkthdr.csum_data; @@ -719,29 +721,20 @@ tcp_input(struct mbuf **mp, int *offp, i ipov->ih_len = htons(tlen); th->th_sum = in_cksum(m, len); /* Reset length for SDT probes. */ - ip->ip_len = htons(tlen + off0); + ip->ip_len = htons(len); + /* Reset TOS bits */ + ip->ip_tos = iptos; + /* Re-initialization for later version check */ + ip->ip_v = IPVERSION; } if (th->th_sum) { TCPSTAT_INC(tcps_rcvbadsum); goto drop; } - /* Re-initialization for later version check */ - ip->ip_v = IPVERSION; } #endif /* INET */ -#ifdef INET6 - if (isipv6) - iptos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; -#endif -#if defined(INET) && defined(INET6) - else -#endif -#ifdef INET - iptos = ip->ip_tos; -#endif - /* * Check that TCP offset makes sense, * pull out TCP options and adjust length. XXX